Magnesium Sulfate, USP Grade *

Also Known as Magnesium Sulfate Heptahydrate and Epsom Salt

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About Magnesium Sulfate, USP Grade

Magnesium Sulfate, also known as Magnesium Sulfate Heptahydrate, Magnesium Sulfate Heptahydrate, and Epsom Salt, is often available as heptahydrate of Magnesium(2+) Sulfate having the chemical formula H14MgO11S or MgSO4-7H2O. It appears as white, odorless hygroscopic crystals or powder and is soluble in Water, Alcohol at ambient conditions. A USPGrade chemical is the one that conforms to the criteria of the United States Pharmacopeia (USP). A substance that has received the USP Grade certification can be used in food, drug, or medical applications. Due to its high purity, Lab Alley’s Magnesium Chloride Powder, USP Grade is a USP Grade chemical. In the United States of America (USA), Lab Alley is selling its high-quality Magnesium Oxide Light, USP Grade online at

Common Uses and Applications

  • Personal Care
  • Households
  • Food processing


Chemistry Table


Magnesium Sulfate, USP Grade Specifications

Assay (MgSO4; Anhydrous basis) 99.0-100.5%
pH of a 5% Solution at 25°C 5.0-9.2
Loss on Ignition 48.0-52.0%
Chloride 0.014%
Iron (Fe) 20 μg/g
Heavy Metals 0.001%
Organic Volatile Impurities To Pass Test
Alkalinity or Acidity To Pass Test
Arsenic 2 ppm
Manganese To Pass Test

Safety and Shipping Information

Please contact us to request a Safety Data Sheet (SDS) and Certificate of Analysis (COA) for Magnesium Sulfate, USP Grade.

View Product Manuals

Certificates of Analysis

Questions & Answers

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  • Hello, I would like to recommend you as a supplier for our beverage client. Would you be able to confirm a Product Data Sheet, or something that says the percent actual MgSO4, or percent Magnesium? Thank you,

    Thank you for your inquiry. 

    The assay of Magensium Sulfate anhydrous is 99.0%. See the sample COA for the product below.